JPH1010744A - Detergent composition for screen printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low toxicity detergent excellent in detergency, not adversely affecting the environment and ensuring low dangerousness even at the time of handling by adding a glycol acetate compd. to a glycol ether compd. SOLUTION: This detergent compsn. consists of a glycol ether compd. represented by the formula R1 O-(R2 O)n -R3 and a glycol acetate compd. In the formula, R1 is 1-4C alkyl, R2 is 2-4C alkylene, R3 is H or 1-4C alkylene and (n) is an integer of 1-4. The glycol acetate compd. is selected from among propylene glycol monomethyl ether acetate, 3-methoxy-3-methybutyl acetate, propylene glycol diacetate and propylene glycol acetate. The glycol acetate compd. is used by 5-50wt.%, preferably 5-35wt.% of the total amt. of the compds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition suitable for a screen printing plate cleaning agent, and more particularly, to a cleaning composition suitable for cleaning printing ink adhered to a screen printing plate during screen printing. Cleaning composition.

[0002]

2. Description of the Related Art Screen printing technology is used in a wide variety of fields in consumer and industrial applications. As printing inks for screen printing, those having various functions have been developed. These oil-based and water-based printing inks for screen printing use various resins such as epoxy-based, acrylic-based, and polyester-based inks. The curing of the screen gradually progresses, causing clogging of the gauze, making it difficult to reuse the screen plate. Therefore, in order to reuse the screen plate, it is necessary to quickly wash the screen plate after use.

Conventionally, in the above-mentioned washing, a chlorine-based solvent such as dichloromethane, 1,1,1, -trichloroethane, trichloroethylene and tetrachloroethylene, a freon-based solvent such as trichlorotrifluoroethane and acetone,
Ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and methyl-n-amyl ketone, and polyalkylene glycol ether solvents such as ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, and diethylene glycol monobutyl ether are used. However, chlorine-based and chlorofluorocarbon-based solvents have problems in terms of environmental pollution and the like, and ketone-based solvents generally have a low flash point, which involves danger and complexity in handling. Further, the polyalkylene glycol ether-based solvent has a disadvantage that the detergency is weak.

On the other hand, a screen plate used for screen printing is a plate material made of gauze such as polyester fiber or stainless steel fiber, which is attached to a frame material made of aluminum or the like. By covering with the corresponding plate film, a certain printing is performed. In general, as a material for closing fine gauze, an emulsion made by using polyvinyl alcohol or the like, a metal plate having an opening formed in a metal plate, or the like is used. Therefore, when the screen plate is washed, the cleaning agent comes into contact with various substrates such as gauze, frame material, emulsion, and the like, so that a cleaning agent that does not attack various substrates must be used.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to an improvement in the oiliness attached to a screen plate or the like at the time of screen printing, compared with a chlorine solvent, a chlorofluorocarbon solvent, a ketone solvent and a polyalkylene glycol ether solvent which have been conventionally used. With excellent washability of aqueous printing ink, low toxicity, does not adversely affect the environment, low risk in handling, and does not attack various substrates such as screen gauze and emulsion,
An object of the present invention is to provide a screen printing plate cleaning agent.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to achieve the above object, and as a result, as a cleaning agent for removing oily and aqueous printing ink adhered to a screen plate or the like during screen printing. , (A) the following general formula (1)
The cleaning composition comprising the glycol ether compound represented by the formula (b) and the glycol acetate compound is excellent in oiliness attached to a screen plate or the like at the time of screen printing and cleaning properties of a printing ink, has low toxicity, and has a low toxicity. It does not adversely affect the surface, is low in danger in handling, and does not attack various substrates such as screen gauze and emulsion.
The present inventors have found that this is a screen printing plate cleaning agent, and have accomplished the present invention. R ₁ O— (R ₂ O) _n —R ₃ (1) wherein R ₁ is an alkyl group having 1 to 4 carbon atoms, R ₂ is an alkylene group having 2 to 4 carbon atoms, and R ₃ is hydrogen or carbon. Number 1
An alkyl group of 4 and n represents an integer of 1 to 4. ]

The compound (a) in the present invention is a glycol ether compound represented by the above general formula. Here, the number of carbon atoms of R ₁ , R ₂ , and R _{3 and} the number of n of (R ₂ O) _n are limited as described above because they are liquid at normal temperature, easily available on the market, Further, as described later, water may be added to the composition of the present invention, in which case it is necessary to dissolve in water, in order to satisfy these requirements.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The glycol ether compound (a) of the present invention represented by the general formula (1) is conventionally known as a detergent for screen printing plates. However, this cleaning agent has low cleaning power. On the other hand, the glycol acetate compound (b) has not been conventionally used as a cleaning agent for screen printing plates. However, according to the study of the present inventor, it has been found that this glycol acetate compound has a very high detergency against oily and aqueous printing inks. On the other hand, this compound has a drawback of attacking various substrates such as screen gauze and emulsion, and therefore cannot be used alone.

Accordingly, the present invention is to improve the detergency by adding a glycol acetate compound to the above glycol ether compound and not to attack various base materials. The glycol ether compound has a certain degree of detergency itself and is compatible with the glycol acetate compound, and is therefore most suitable as a compound to be added to the glycol acetate compound.

The (a) glycol ether compound represented by the general formula (1) of the present invention is preferably a propylene glycol ether, and specific examples thereof include propylene glycol methyl ether, propylene glycol ethyl ether and propylene glycol. n-propyl ether, propylene glycol-iso-propyl ether, propylene glycol-n-butyl ether, propylene glycol-iso-butyl ether, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dipropylene glycol ethyl ether, dipropylene glycol-n- Propyl ether, dipropylene glycol-n-butyl ether, tripropylene glycol methyl ether, tripropylene glycol ethyl Ether, tripropylene glycol -n- propyl ether, tripropylene glycol -n- butyl ether can be exemplified. Examples of the glycol acetate compound include at least one selected from propylene glycol monomethyl ether acetate, 3-methoxy-3-methylbutyl acetate, propylene glycol diacetate, and propylene glycol acetate.

Next, the mixing ratio of the above (a) and (b) increases as the amount of the glycol acetate compound increases, but the effect on various base materials increases, so that the mixing ratio is preferably suppressed to 50% by weight or less. , Preferably 35% by weight or less, more preferably 20% by weight or less. The amount of the glycol acetate compound is preferably 5% by weight or more, and more preferably 10% by weight or more, in order to enhance detergency. Accordingly, the composition range is preferably such that the glycol ether compound is used in the range of 50 to 95% by weight and the glycol acetate compound is used in the range of 5 to 50% by weight. It is more desirable to do so.

The cleaning composition of the present invention contains (c) 30 water.
% By weight, preferably 20% by weight or less. The addition of water has the advantage that the flash point is eliminated and the cleaning composition is treated as a non-dangerous substance as defined by the Fire Service Law. However, when (c) water is contained in an amount exceeding 30% by weight, the detergency of the ink is reduced, and depending on the type of emulsion, the influence of swelling and peeling is increased, and the reusability of the screen plate is reduced. Become. When water is added, preferred composition ratios are (a) 40 to 65% by weight of a glycol ether compound, (b) 5 to 30% by weight of a glycol acetate compound, and (c) 30% by weight of water.
It is as follows.

The screen plate for screen printing, oil-based and water-based printing inks, etc., which are the objects of the present invention, are not particularly limited, and can be arbitrarily selected from commonly used ones.

[0014] In the screen plate, for example, a gauze stretched with polyester fiber, stainless steel fiber, silk, etc., contains a thermosetting resin, a photosensitive agent and the like in a film constituting agent such as polyvinyl alcohol, vinyl acetate emulsion and acrylic acid emulsion. And a metal mask for etching, electroforming, laser cutting, and the like, and a combination mask that is a combination thereof.

[0015] Examples of the printing ink include oil-based and water-soluble printing inks, which are prepared by kneading pigments or functional particles mainly using a plastic solution as a vehicle. These screen printing plates and oil-based and water-soluble printing inks can be used in various combinations, and in any case, the screen printing plate cleaning agent of the present invention can be applied.

The cleaning method using the cleaning agent of the present invention is particularly limited as long as the cleaning treatment of the cleaning agent of the present invention is performed by contacting the ink deposits of oily or water-soluble printing ink such as a screen printing plate with the cleaning agent of the present invention. Not something to do. For example, the cleaning agent of the present invention is supplied by air or nitrogen pressurization or by a pump or the like to be brought into contact with a screen plate or the like to be cleaned, or a screen to be cleaned in the cleaning agent of the present invention. Cleaning can be performed by immersing the plate or the like and performing ultrasonic cleaning or the like, or by directly cleaning the ink-attached portion with a cleaning cloth soaked with the cleaning agent of the present invention.

Drying can be performed by natural drying as it is, forced drying using an air knife or the like, or feeding hot air, but is not limited to this as long as drying is possible.

[0018]

EXAMPLES [Examples 1 to 8] Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited thereto. Each cleaning composition was prepared in accordance with the formulation shown in Table 1, and tests for confirming cleaning performance and the like were performed for the following items. Further, as comparative examples, the detergents of Comparative Examples 1 to 4 were prepared according to the formulations shown in Table 1, and the tests were performed in the same manner. The compound (b) alone is not mentioned in the comparative examples because the compound alone has too great an effect on various substrates and is not suitable.

[Test Items and Test Methods] Washing performance (ink washability test) A screen plate (30 mm
X 10 mm), left to dry at room temperature for 15 minutes, put in 100 ml of detergent at 40 ° C, washed with ultrasonic vibration for 2 minutes, taken out quickly, and visually observed the screen plate. Observations were made to determine if the ink had been removed from the screen plate. The criteria are shown below. Test result Judgment ・ Completely cleaned. ■ ・ Partially remained, but was almost completely cleaned. C: Little or no cleaning was possible. × (Type of ink used) (1) Thermosetting one-pack type solder resist ink ・ S-40 (manufactured by Taiyo Ink Manufacturing Co., Ltd.) (2) Thermosetting one-pack type marking ink ・ S-100W CM29 (Taiyo (3) Thermosetting two-pack type solder resist ink ・ S-222 X16 / HD-1 (manufactured by Taiyo Ink Mfg. Co., Ltd.) (4) Thermosetting one-pack type screen printing ink ・VINYL LOV [710 Black] (manufactured by Seiko advance) (5) Thermosetting two-part screen printing ink ・ EPOXY 1000 / EPOXY # 1000 [510 American Red] (Seiko advance

2. Influence on plate film (emulsion) A screen plate (20 mm x 50 mm) having a polyvinyl alcohol emulsion formed on the entire surface is put in 100 ml of a detergent at 40 ° C, washed by ultrasonic vibration for 60 minutes, and quickly taken out. The surface state of the plate and the state of dissolution in the cleaning solution were visually observed. The criteria are shown below. Test results Judgment ・ No swelling or peeling of emulsion and no penetration into detergent was observed. -Some swelling and peeling of the emulsion and some dissolution into the detergent were observed. -Many swelling and peeling of the emulsion and × dissolution into the detergent were observed.

3. Effect on plate adhesive (adhesive tape) Clean aluminum plate with flat surface (20mm x 30mm)
Special tape material (1
0 mm x 20 mm), and this was washed with 40 ° C detergent 100
After being placed in a ml, washed with ultrasonic vibration for 60 minutes and quickly taken out, the adhesion of the tape material to the aluminum plate was visually observed. The criteria are shown below. Test results Judgment ・ No peeling or swelling of the tape was observed. ■-Tape peeling and swelling were somewhat observed. C: Peeling and swelling of the tape were clearly observed. ×

[0022]

[Table 1]

[0023]

The cleaning composition for a screen printing plate of the present invention comprises (a) a composition of a glycol ether compound represented by the general formula (1) and (b) a glycol acetate compound, and the screen printing is carried out. It has excellent cleaning properties for oily and water-based printing inks attached to screen plates, etc. at the time, has low toxicity, does not adversely affect the environment, has low danger in handling, and has various types of base such as screen gauze and emulsion. It has excellent effects such as not attacking the material.

Claims (5)

[Claims] 1. A detergent composition for a screen printing plate comprising (a) a glycol ether compound represented by the following general formula (1) and (b) a glycol acetate compound. R ₁ O— (R ₂ O) _n —R ₃ (1) wherein R ₁ is an alkyl group having 1 to 4 carbon atoms, R ₂ is an alkylene group having 2 to 4 carbon atoms, and R ₃ is hydrogen or carbon. Numbers 1-4
And n represents an integer of 1 to 4. ] 2. The glycol acetate compound according to claim 1, wherein the glycol acetate compound is at least one selected from propylene glycol monomethyl ether acetate, 3-methoxy-3-methylbutyl acetate, propylene glycol diacetate, and propylene glycol acetate. The cleaning composition for a screen printing plate according to claim 1, wherein the cleaning composition comprises: 3. The cleaning composition according to claim 1, comprising (a) a glycol ether compound represented by the general formula (1) and (b) a glycol acetate compound.
The cleaning composition for a screen printing plate according to claim 1, wherein the content of (b) is from 5% by weight to 50% by weight. 4. The screen printing plate cleaning composition according to claim 1, which comprises (c) 30% by weight or less of water. 5. Glycol ether compounds represented by the general formula (1):
65% by weight and glycol acetate compound 5 to 30
% By weight of a screen printing plate detergent composition